Fix win64 build error

gin/modules/module_registry.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/modules/module_registry.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 163 matching lines @@
     num_missing_dependencies++;
   }
   return num_missing_dependencies == 0;
 }
 
 void ModuleRegistry::Load(Isolate* isolate, scoped_ptr<PendingModule> pending) {
   if (!pending->id.empty() && available_modules_.count(pending->id))
     return;  // We've already loaded this module.
 
   Handle<Object> modules = Local<Object>::New(isolate, modules_);
-  size_t argc = pending->dependencies.size();
+  uint32_t argc = static_cast<uint32_t>(pending->dependencies.size());
   std::vector<Handle<Value> > argv(argc);
-  for (size_t i = 0; i < argc; ++i) {
+  for (uint32_t i = 0; i < argc; ++i) {
     Handle<String> key = StringToSymbol(isolate, pending->dependencies[i]);
     DCHECK(modules->HasOwnProperty(key));
     argv[i] = modules->Get(key);
   }
 
   Handle<Value> module = Local<Value>::New(isolate, pending->factory);
 
   Handle<Function> factory;
   if (ConvertFromV8(module, &factory)) {
     Handle<Object> global = isolate->GetCurrentContext()->Global();
@@ skipping 23 matching lines @@
     for (size_t i = 0; i < pending_modules.size(); ++i) {
       scoped_ptr<PendingModule> pending(pending_modules[i]);
       pending_modules[i] = NULL;
       if (AttemptToLoad(isolate, pending.Pass()))
         keep_trying = true;
     }
   }
 }
 
 }  // namespace gin